Tool assembly



Aug- 5, 1958. A. T. KoHLsTRUNK 2,845,922

TooL ASSEMBLY Filed April 9, 195e EDI 2,845,922 latented Aug. 5, 1958Trueing Tool Company, Detroit, Mich., a corporation of DelawareApplication apar 9, i956, sensi No. 577,14@ 7 ciaims. (ci. 12s- 39) This invention relates in general to a new type of tool assembly, andmore particularly to a tool holder for use in dressing or trueing rotarywork such as abrasive wheels or the like, and still more particularly toa diamond dressing tool assembly.

ln the use of abrasive wheels and the like, faces of such wheels mustnecessitates dressing them from time to time. common method of dressingerse the surface of wheel rotates about its avis. Continued use of adiamond dressing tool causes the surface of the diamond point to wearunevenly resulting in the dulling of the edge of the diamond which doesnot present a good cutting edge to the abrasive wheel surface. Toovercome this diliculty, several types of rotatable diamond toolmountings have been developed so that the diamond point may beperiodically rotated to present a new sharp edge to the working face ofa wheel. However, in the past, these rotatable tool mountings have, inmost cases, been constructed ated parts and have required special toolsor mechanisms for effecting their rotation.

Accordingly, it is an object of this invention to provide a toolassembly which obviates the above mentioned dilcnlties and is of simpleand economical manufacture.

Another object of this invention resides in the provision of a dressingtool assembly, wherein the cutting end may be rotated by an ordinarywrench.

A further object of this invention resides in the provision of a diamonddressing tool assembly that may be and improved the Workingincrementally rotated to present a new sharp edge of the diamond fordressing purposes by a simple wrench.

A still further object of this invention resides in the provision of adressing tool assembly including a cutting tool rotatably mounted in aholder and shaped to receive a wrench enabling the cutting tool to beeasily rotated by hand.

Other objects, features, and advantages of the invention will beapparent from the following detailed disclosure, taken in conjunctionwith the accompanying sheets of drawings, wherein like referencenumerals refer to like parts, in which:

Figure l is an axial section view, with some parts in elevation, takenthrough a dressing tool assembly constructed in accordance with theinvention;

Figure 2 is an end elevational View of the assembly shown in Figure land looking at the cutting or dressing end of the assembly;

Figure 3 is a transverse sectional View, with some parts in elevation,taken substantially along line lll-ill of Figure 1;

Figure 4 is a transverse sectional view, with some parts in elevation,taken substantially along line lV-lV in Fivure l; and

Figure 5 is an exploded view of the tool assembly of the presentinvention showing its component parts.

In Figure l, the tool assembly of the present invention is seen togenerally comprise a holder 11i, a cutting 0r dressing tool 11, alocking and resilient thrust member 12 in the form of a U-shaped spring,and a sleeve 13.

The holder 1t) includes a shank 14 adapted to be received in aconventional slide for supporting and adjustably positioning theassembly in relation to an abrasive wheel, and a diametrically enlargedtool receiving portion 15. This tool receivin portion includes an axialpilot bore 16, a radial bearing surface or face 17 at the inlet end ofthe bore, and a transverse slot 1S extending through the tool receivingportion 15 in the vicinity of the pilot bore and spaced inwardly fromthe radial bearing face 17.

The dressing or cutting tool 11 includes a cylindrically shaped pilot 19sized to be rotatably received in the A radial bearing surface or face22 is defined between the pilot 19 and the diamond carrying head 20which bearingly contacts the bearing face 1/ of the holder. As seen mostclearly in Figure 2, the enlarged headportion 20 of the dressing tool 11is polygonallyshaped, in this instance hexagonal in shape, toaccommodate a conventional wrench for rotating the tool relative to theholder 10. The pilot 19 is provided with a circumferential annulargroove 23 in spaced relation from the bearing surface 22 and insubstantial alignment with the slot 18 of the holder 10.

As seen most clearly in Figures Vl and 4, the U-shaped lock and thrustspring 12 includes legs 1251,'12a con- The spring 12 is forciblyinserted into the slot 1S of the holder with the convex side of thespring facing towards the shank 14 of the holder 10, wherein the springengages the diamond tool at the annular groove 23. As seen in Figure l,the sides of the spring bight 12b and the very free ends of the legs 12afacing the enlarged head portion 20 of the tool 11 and bear against theforward side of the slot 18, while the intermediate portions of thespring legs 12a on the opposite side bear against the rear side of theannular groove 23 of the tool 11. Thus, the spring 12 forces the tool 11rearward yrelative to the holder 10 so that the bearing surfaces 17 and22 are resiliently urged together. While the spring 12 serves toresiliently thrust the tool 11 against the holder 111, it also serves tolock the tool and holder together.

The sleeve 13 is forcibly pressed on the tool receiving portion 15 ofthe holder 1l) to maintain the spring 12 in locking position.

As best shown in Figure 1, means is provided to control the rotation ofthe tool 11 relative to the holder 10 so that uniforming indexing of thetool may be accomplished, which includes a transverse bore 24 formed inthe pilot 19 of the tool 11. The bore 24 receives a spring indexing ofthe tool 11 with respect to the holder 10, a plurality of these holes2.7 are formed in the holder 10 in equal circumferentially spacedrelationship.

ln operation, when one facet of the diamond point 21 becomes worn, thediamond tool 11 may be rotated relative the holder 10 by merely applyinga wrench to the hexagonal head 2l) of the tool and rotating the tooluntil the ball detent indexes in the ,next succeeding radial hole 27,wherein a new dressing edge is presented by the diamond point to theabrasive wheel.

In assembling the dressing tool of the present invention, the spring 25and ball detent 26 are inserted in the bore 24 of the pilot 19 and thetool 11 is rotatably asso- 3 ciated with the holder so that the annulargroove 23 substantially aligns with the transverse slot 1S. Then thespring member 12 is forcibly inserted through the transverse slot 18 andover the tool pilot 19 to lock the tool and holder together and bias thetool rearwardly against the holder. Next, the sleeve 13 is forciblypressed on the tool receiving portion 15 of the holder 10 for housingthe assembled parts.

From the foregoing, it is appreciated that the present inventionprovides a dressing tool assembly having a minimum of parts that may beeasily and economically assembled, wherein manual rotation of thediamond tool by means of a conventional Wrench is permissible.

It will be understood that modiiications and variations may be effectedWithout departing from the scope of the novel concepts of the presentinvention, but it is understood that this application is to be limitedonly by the scope of the appended claims.

I claim as my invention:

l. ln a tool assembly 1for use in the dressing of rotary work such asgrinding Wheels or the like, a holder having` an axial pilot bore, atool having at one end a pilot rotatably iournaled in said bore andhaving at the other end a polygonally-shaped head for receiving awrench, said holder including radially disposed holes, rotary indexcontrol mechanism between the periphery of said pilot and said holdercomprising a radially urged resilient element carried by said pilot forcooperation With the adjacent ends of said radial holes of said holder,resilient thrust resisting and locking means in cooperation with a slotin said holder aligned with a groove in said pilot, and a sleeve ttedover said slot in the holder retaining said parts in assembled relation.

2. A tool assembly for use in the dressing or trueing of rotary worksuch as grinding wheels or the like, which comprises a holder having anaxial pilot bore at one end, a transverse slot through said holder inthe vicinity of the bore, a radial bearing surface at said one end, acutting tool having a pilot rotatably received in said bore and anenlarged head portion extending from said pilot for carrying a cuttingmember, said pilot having an annular groove thcrearound in alignmentwith the slot in said holder, a radial bearing surface defined betweenthe pilot and the head portion of said cutting tool and bearinglycontacting said bearing surface of said holder, a U-shaped spring memberreceived by said slot and said groove for resiliently locking saidholder and said cutting tool together, and a sleeve surrounding saidhead portion and retaining said spring member in place.

3. A tool assembly for use in the dressing or trueing of rotary Worksuch as grinding wheels or the like, which comprises a holder having anaxial pilot bore at one end, a transverse slot through said holder inthe vicinity of the bore, a radial bearing surface at said one end, acutting tool having a pilot rotatably received in said bore and anenlarged head portion extending from said pilot for carrying a cuttingmember, said head portion being polygonally-shaped for receiving awrench, said pilot having an annular groove therearound in alignmentwith the slot in said holder, a radial bearing surface defined betweenthe pilot and the head portion of said cutting tool and bearinglycontacting said bearing surface of said holder, a U-shaped spring memberreceived by said slot and said groove for resiliently locking saidholder and said cutting tool together, and a `sleeve surrounding saidhead portion and retaining said spring member in place.

4. A tool assembly for use in the dressing or trueing of rotary Worksuch as grinding wheels or the like, which comprises a holder having ana transverse slot through said holder in the vicinity of the axial pilotbore at one end,

bore, a radial bearing surface at said one end, a cutting Itool having apilot rotatably received in said bore and an enlarged head portionextending from said pilot for carrying a cutting member, said pilothaving an annular groove therearound in `alignment with the slot in saidholder, a radial 'bearing surface delined between the pilot and the headportion of said cutting tool and bearingly contacting said bearingsurface of said holder, a U-shaped spring member laterally insertable tolbe received by and retained in said slot and said groove forresiliently locking said holder and said cutting tool together, and asleeve secured to said holder over said slot for retaining said U-shapedmember in position.

5. A tool assembly for use of the rotary worl; such as grinding wheelsor the like, which comprises a holder having an axial pilot bore at oneend, a transverse slot through said holder in the vicinity of the bore,a radial bearing surface at the inlet to said bore, a plurality ofradial holes leading from said bore, a cutting tool having a pilotrotatably received in said bore and an enlarged head portion carrying acutting member, a radial bearing face on said cutting tool between thepilot and head portion bearingly engaging said holder bearing surface, adetent carried on said pilot and being biased radially outward toresiliently engage the inner radial end of a hole in said holder, andmeans received in said slot for maintaining the bearing surface of saidholder and the bearing face of said cutting tool resiliently engaged.

6. A tool assembly for use in the dressing or trueing of rotary worksuch as grinding wheels or the like, which comprises a holder having anaxial pilot bore at one end, a transverse slot through said holder inthe vicinity of the bore, a radial bearing surface at said one end, aplurality of circumferentially spaced radial holes leading from saidbore, a cutting tool having a pilot rotatably received in said bore andan enlarged head portion extending from said pilot for carrying acutting member, a radial bearing surface defined between the pilot andthe head portion of; said cutting tool and bearingly contacting saidbearing surface of said holder, a detent carried on said pilot and being'biased radiaily outward to resiliently engage the inner radial end of ahole in said holder, and means received in said slot for maintaining thebearing surfaces resiliently engaged.

7. A tool assembly for use in the dressing or trueing of rotary worksuch as grinding wheels or the like, which comprises a holder having anaxial pilot bore at one end, a transverse slot through said holder inthe vicinity of the bore, a radial bearing surface at said one end, aplurality of circumferentially spaced radial holes leading from saidbore, a cutting tool having a pilot rotatably received in said bore andan enlarged head portion extending from said pilot for carrying acutting member, said pilot having a circumferential groove in alignmentwith said slot, a radial bearing surface deiined between the pilot andthe head portion of said cutting tool and bearingly contacting saidbearing surface of said holder, a detent carried on said pilot and beingbiased radially outwardly to resiliently engage the inner radial end ofa hole in said holder, and means received by said slot and said groovefor resiliently locking said holder and said cutting tool together.

References Cited in the iile of this patent UNlTED STATES PATENTS1,405,605 Madison Feb. 7, 1922 2,405,476 Weatherhead Aug. 6, 19462,738,784 Karpovitz Mar. 30, 1956 FOREIGN PATENTS 546,401 Great BritainJuly 10, 1942 in the dressing or trueing

